[Differences in the cyto- and angioarchitectonics of the ventral horns of the spinal cord in higher and lower vertebrates].

When comparing structures of the ventral horns of the spinal cord in amphibia (Rana esculenta) and Carnivora (cat, dog), it has been stated that in the latter, together with increasing number of neurons their blood supply is improving. This is demonstrated as a growing density of the capillary network in the cerebral substance and increasing number of capillaries within 25 mcm around the neuronal bodies. Glial surrounding of the neurons changes considerably. Both in the amphibia and Carnivora astrocytes and oligodendrocytes play the role of neuronal satellites. But in the amphibia astrocytes as satellites occur much more often than oligodendrocytes. This is evidently connected with a low blood supply and with certain peculiarities of metabolic processes in the cerebral tissue.